the fbi, following the trail of this man, adam mayes, who they say kidnapped the 31-year-old, along with 14-year-old adrienne, 12-year-old alexandria and 8-year-old kyliyah. >> time is absolute lly critica. you have two people dead and two possible in peril, so every minute counts. >> reporter: investigators need autopsy results to confirm the identities of those bodies, but and they believe mayes has changed his appearance and that of the girls. he's described as a trusted friend of bain's husband, helping the family with a move to arizona in the days before the alleged kidnapping last friday. the mother's abandoned suv was found two days later, not far from her whiteville, tennessee, home. police say they spoke to mayes that day. he gave them misleading information, then disappeared tuesday. the fbi tells me hundreds have tips have been rolling in and there is a $50,000 reward being offered. but what takes this investigation so difficult is that police have no information about the vehicle that may else bay be driving. >> tanya rivero, thank you. >>> we're going to turn next to a flash